JPH0513810B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an injection molding apparatus, and particularly to an injection molding apparatus in which all temperature control associated with injection molding can be centrally performed in the injection molding machine body. .

[Conventional technology]

In recent years, the use of microcomputers has developed,
It is also used to control injection molding machines. The targets of microcomputer control in injection molding machines are mainly temperature condition settings such as heating cylinder heater temperature, digital settings of molding conditions such as pressure, speed, time, etc., and furthermore, molding conditions that enable the final good product to be formed. This process includes storing the data in an external storage device, and then resetting the molding conditions in one operation when molding is performed using the mold.

[Problem that the invention seeks to solve]

However, in the case of conventional injection molding equipment, the conditions set by the microcomputer are only for those installed in the molding machine body, and the mold temperature, which is almost the most important injection molding condition,
The drying temperature of the raw resin is controlled independently using a separate system of equipment. For this reason, in order to comprehensively manage good product molding, adjustments must be made for each piece of equipment.
It had poor operability and workability.

The object of the present invention has been made in view of the above-mentioned actual state of the prior art, and it is an object of the present invention to collectively control the temperature of peripheral equipment (molds, raw material dryers, annealing, etc.) other than the injection molding machine main body using the injection molding machine main body. An object of the present invention is to provide an injection molding apparatus that can perform injection molding.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides an injection molding apparatus equipped with at least a mold temperature adjustment device and a raw material dryer peripheral equipment in addition to the injection molding machine main body, at least a heating cylinder of the injection molding machine main body. a temperature sensor that detects each of a plurality of heater temperatures, a resin temperature in the heating cylinder, a fixed mold temperature and a movable mold temperature of the mold temperature adjustment device, and a hopper dryer temperature of the raw material dryer; Measured values, set values that serve as reference values for each of heater temperature, resin temperature, fixed mold temperature, movable mold temperature, and hopper dryer temperature, and are set based on the set values, and the molding process will not stop if the values exceed the relevant values. The injection molding machine is configured to display, respectively, a first upper limit value and a lower limit value at which a warning is issued, and a second upper limit value and a lower limit value which are set based on the set value and which stop the molding process when the value exceeds the set value. a temperature display panel attached to the main body; temperature setting means for setting the set value, the first upper limit value and the lower limit value, and the second upper limit value and the lower limit value; and an actual measurement value detected by the temperature sensor. warning generation means for issuing a warning when the temperature exceeds a first upper limit or lower limit; and stopping the molding process when the actual measured value detected by the temperature sensor exceeds a second upper or lower limit. The invention is characterized by comprising a control means.

[Effect]

As described above, in the present invention, among the information regarding the temperature of the injection molding machine main body and its peripheral equipment, in particular, the multiple heater temperatures in the heating cylinder, the resin temperature in the heating cylinder, and the mold, which directly affect the molding quality. Measured values, set values, upper limits, and lower limits for each of the fixed mold temperature and movable mold temperature of the temperature adjustment device, and the hopper dryer temperature of the raw material dryer are displayed together in one place.

Therefore, each injection molded shot is of good quality.
While checking the condition of defective products, correlate the set value, upper limit value, and lower limit value for each temperature,
It can be changed on the same setting means. As a result, molding quality is improved and injection conditions can be easily changed.

Further, the upper and lower limits for each temperature are set separately for the first stage, in which the molding process does not stop but a warning is issued, and the second stage, in which the molding process is immediately stopped. This prevents the operation of the injection molding equipment from being stopped unnecessarily.
It is possible to improve the movement rate of the device.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the configuration of a control panel according to an embodiment of the present invention, and FIGS. 2 and 3 are plan views showing details of the operation panel and display section shown in FIG. 1.

In Fig. 1, T1 to T15 are thermocouples that measure the temperature of cylinders, etc., and H1 to H5, H
8. H10 to H15 are heaters. Also MV
7. MV8, MV13 to MV15 are solenoid valves.
Each symbol and installation position will be explained based on FIG. 4.

Each output of the thermocouples T1 to T15 is connected to an input terminal board 2, and a multiplexer (MPX) 3 that selects only one of the 16 terminals to this input terminal board 2 is connected to the input terminal board 2.
and an input interface (IN) 4 are connected in sequence. A bus line 5 is connected to the input interface 4, and each member of this bus line 5 is commonly connected.

The bus line 5 includes a RAM 6 that temporarily stores data, etc., a ROM 7 that stores programs and unique setting values, and a CPU 8 that executes temperature control control, etc., including the program in the ROM 7 and commands to stop operation of the device. , output interface (OUT) 9
- 11, and a keyboard (KB) 12 are connected.

The output interface 9 has an output terminal 15.
A multiplexer (MPX2) 12 for selecting one of the 16 terminals is connected, and a CRT 13 is connected to the output interface 10. Further, a speaker 14 for issuing alarms and the like is connected to the output interface 11.

Output terminal 15 has heaters H (12 pieces) and solenoid valves.
MV (5 pieces) are connected.

The keyboard 12 is used to set the temperature of each temperature control section,
and its upper and lower limits (limit temperature at which molding is stopped when the measured temperature of each part is above the upper limit or below the lower limit), values of P, I, and D for PID control, monitor temperature setting value, monitor Max, monitor Min ( The measured temperature of each part is higher than the monitor Max temperature or the monitor Min temperature
The temperature limit below which molding will not be stopped but an alarm will be issued. ), etc., and its configuration is as shown in Figure 2.

As shown in FIG.
(Switching between manual, automatic, etc.), manual operation key 17 (injection, charge, etc.), display key 18 (displaying status of monitor, etc.), cursor key 19, data memory, printer key 20, numeric keypad 21, etc. 12 is configured.

Further, the CRT 13 is provided integrally with or near the keyboard 12, and as shown in FIG. 3, the values set on the keyboard 12 and the temperature measurement value measured by a thermocouple, which is a temperature sensor, are displayed. .

FIG. 4 shows the configuration of an injection molding machine to which the present invention is applied.

The mold consists of a movable mold 25 and a fixed mold 26, each of which has water holes 27, 28.
is provided. Hot water circulators 29 and 30 are provided to circulate hot water through the water holes 27 and 28, and the temperature of the hot water is controlled by heaters H13 and H14.
and cooling solenoid valves MV13 and MV14.

A nozzle 31 is disposed so as to be able to come into contact with the fixed mold 26, and a bracket 32 for holding the tip of the thermocouple T6 is disposed inside the nozzle 31. This bracket 32 prevents the temperature measuring tip T6a from being bent by the high pressure of the resin flow during injection, and is formed with a plurality of through holes 33 through which the resin flow passes.

The nozzle 31 is connected to a cylindrical heating cylinder 36 via a bracket holder 34 and an adapter 35. The heating cylinder 36 has a screw 37 rotatably disposed in its center. Further, a raw resin dryer (hopper dryer) 38 is attached to the base of the heating cylinder 36, and a turbo fan 40 having an air heating chamber 39 is attached to the hopper dryer 38. Note that 41 is an air supply port provided in the turbo fan 40.

An annular water passage hole 43 is bored in the cylinder base material before and after the hopper port 42 of the heating cylinder 36,
Cooling water is supplied from a cooling water source 44 via a solenoid valve MV7 and an orifice 45. In addition, as an alternative method for temperature control at the hopper opening, a small hot water circulator 46 is provided, in which cooling water is supplied from a cooling water source 44 via a solenoid valve MV8, and hot water is supplied to an orifice 45 via a pump 47. Water is supplied to the inlet side.

Thermocouple T, heater H, and solenoid valve MV are attached or installed at the following locations. First, thermocouples are attached to the following parts.

T1...outer circumference of nozzle 31, T2...nozzle side of heating cylinder 36, T3...center of 〃 〃, T4...near the hopper mouth of 〃, T5...vent opening, T6...inside the bracket 32, T7...water flow Near the hole 43, T8...Inside the hot water circulator 46, T9...Inside the hydraulic oil tank (not shown), T10...Inside the air heating chamber 39, T11...Inside the movable mold 25, T12...Inside the fixed mold 26, T13... Inside the hot water circulator 29, T14...in the hot water circulator 30, T15...in the annealing water tank 48, inside the molded product, in order to slowly cool it outside the mold or remove internal stress, there are A hot water tank 48 may be required as shown. The hot water temperature is also an important molding condition. For temperature control, it is equipped with a heater H15, a two-way solenoid valve MV15 for turning the cooling water on and off, and a temperature sensor T15.

Thermocouples T1 to T15 are sensors having the following functions. The # number corresponds to the number of the input terminal board 2.

#1: T1 Nozzle temperature sensor #2: T2 Heating cylinder front temperature sensor #3: T3 Heating cylinder center temperature sensor #4: T4 Heating cylinder rear temperature sensor #5: T5 Heating cylinder special part temperature sensor (e.g. vent For screw-type heating cylinders, vent opening temperature sensor, etc.) #6: T6 Resin temperature sensor #7: T7 Heating cylinder hopper port 42 part temperature sensor #8: T8 Hot water circulation for heating cylinder hopper port 42 part Machine hot water temperature sensor #9: T9 Hydraulic oil tank oil temperature sensor #10: T10 Hopper dryer 38, air heating chamber 39 temperature sensor #11: T11 Moving side mold 25 temperature sensor #12: T12 Fixed side metal Temperature sensor #13 of the mold 25: T13 Hot water temperature sensor #14 of the hot water circulator 29 for the movable mold: T14 Hot water temperature sensor #15 of the hot water circulator 30 for the stationary mold 30: T15 Hot water temperature sensor of the annealing water tank 48 Additionally, heaters and solenoid valves are provided in the following parts.

#1: H1 Nozzle heater #2: H2 Front heater of the heating cylinder #3: H3 Central heater of the heating cylinder #4: H4 Rear heater of the heating cylinder #5: H5 Special part heater of the heating cylinder (for example, in the case of a vent screw type heating cylinder) , vent opening heater, etc.) #7: MV7 Two-way solenoid valve solenoid for cooling water at the heating cylinder hopper opening #8: H8, MV8 Two-way solenoid for the hot water heater and cooling water in the tank of the hot water circulator 46 Solenoid of the two-way solenoid valve #9: MV9 Solenoid of the two-way solenoid valve for passing or blocking cooling water to the hydraulic oil cooler #10: H10 Heater #11 of the air heating chamber 39 of the hopper dryer 38: H11 Heater #12 for the movable mold 25: H12 Heater #13 for the stationary mold 25: H13, MV13 Solenoid #14 of the heater of the hot water circulator 29 dedicated to the movable mold and the cooling water 2-way solenoid valve: H14, MV14 Solenoid #15 of the heater and cooling water 2-way solenoid valve of the hot water circulator 30 dedicated to the moving mold: H15, MV15 Annealing water tank 48
Hot water heater and cooling water 2-way solenoid valve solenoid Among the above, for #8, #13, #14, and #15, when the heater is ON, the solenoid of the cooling water 2-way solenoid valve is OFF. When the heater is OFF, the solenoid of the cooling water 2-way solenoid valve is controlled to be ON.

In the above configuration, after the movable mold 25 is aligned with the fixed mold 26, the nozzle 31 is applied to the resin injection port of the fixed mold 26. The resin raw material is supplied from the hopper dryer 38 into the heating cylinder 36 through the hopper port 42 . Since the screw 37 is rotating, the supplied resin raw material is transferred to the heaters H1 to H4.
It is conveyed to the nozzle 31 while being heated and melted by.

Since cooling water is circulated through the water passage hole 43 of the heating cylinder 36, the temperature of the hopper port 42 is maintained at an optimum level. The passage of this cooling water is controlled by MV7, the temperature of the hot water in the hot water circulator 46 is controlled by heater H8 and solenoid valve MV8, and the temperature is measured by sensor T8.

The resin that has reached the nozzle 31 is press-fitted into the cavities of the movable mold 25 and the fixed mold 26. The mold is heated by heaters H11 and H12, and its temperature is controlled by sensors T11 and T12. In addition, in the case where hot water is circulated through the water holes 27 and 28, the hot water in the hot water circulation machines 29 and 30 is supplied to the heaters H13 and 14 and the solenoid valves MV13 and 1.
4, and its temperature is measured at T13 and T14.

In addition, raw resin dryer (hopper dryer) 3
At step 8, hot air is passed through the raw material resin supplied to the heating cylinder to drive out moisture and dry it. This equipment is especially indispensable for molding highly hygroscopic resins such as polyamide resin and polycarbonate resin. Air supply port 41 of dryer 38
Outside air is introduced by the turbo fan 40, and heated by the heater H10 in the air heating chamber 39.
The temperature of the air heating chamber 39 is measured by a sensor T10.

Next, an example of temperature control operation will be explained with reference to FIGS. 2 and 3.

The cursor key 19 is initially located at the setting value of the heater H1. By pressing, for example, the "2", "3", "0", and "Entry" keys in sequence using the numeric keypad 21, the heater H1 is set to 230°C. Next, when "R" is pressed on the cursor key 19, the cursor moves to the location of the set value of the heater H2. Therefore,
For example, by pressing the "2", "3", "5" and "Entry" keys in sequence, the heater H2 is set to 235°C. Similarly, while shifting the cursor to the right using the cursor key 19, temperature settings for all heaters are performed.

On the other hand, the settings and monitor status are displayed on the CRT screen. From the top of the display, the measured value measured by the temperature sensor, the set temperature, the upper and lower limit deviations around the set temperature, whether to use that part of the heater (○) or not to use it (×),
These are the P value (°C), I value (sec), D value (sec), monitor temperature, monitor Max temperature, and monitor Min temperature of PID control.

For example, if you set "2" or "0" for heater H1 in the upper limit field at the bottom of the set value, the overheat alarm will be activated when the upper limit width +20 °C is reached for the set value of 230 °C, that is, 250 °C. , stop automatic operation. The lower limit width can also be set in the same way.

Furthermore, the actual temperature of each zone of the temperature sensor is displayed as the monitor temperature. Max and Min displayed at the bottom of the monitor temperature column are used to determine that the shot product is defective when the actual temperature is above or below the set temperature.

As explained in the previous section [Problems to be Solved by the Invention], molding conditions such as the mold temperature and the drying temperature of the raw resin are important factors in controlling the molding of good products.

Next, examples of the relationship between each defective molding phenomenon and the temperature of each part in the order of its relationship are as follows. In the following items, the heating cylinder temperature refers to the third
In the figure, the heater temperature and resin temperature are shown, the mold temperature is the fixed mold temperature and the movable mold temperature, and the resin drying temperature is the hopper dryer temperature and the hopper temperature.

a Warpage, distortion Heating cylinder temperature Mold temperature Resin drying temperature b Burning Heating cylinder temperature Mold temperature Resin drying temperature c Bubbles Mold temperature Resin drying temperature Heating cylinder temperature d Weld line Heating cylinder temperature Mold temperature Resin drying temperature e Silver streak Heating cylinder temperature Resin drying temperature Mold temperature In this way, each molding defect phenomenon has a very deep correlation with the temperature of each part.

〔Effect of the invention〕

As explained above, in the present invention, among the information regarding the temperature of the injection molding machine main body and its peripheral equipment, in particular, a plurality of heater temperatures in the heating cylinder that directly affect the molding quality, the resin temperature in the heating cylinder, the mold Measured values, set values, upper limits, and lower limits for each of the fixed mold temperature and movable mold temperature of the temperature adjustment device, and the hopper dryer temperature of the raw material dryer are displayed together in one place.

Therefore, each injection molded shot is of good quality.
While checking the condition of defective products, correlate the set value, upper limit value, and lower limit value for each temperature,
It can be changed on the same setting means. As a result, molding quality is improved and injection conditions can be easily changed.

Further, the upper and lower limits for each temperature are set separately for the first stage, in which the molding process does not stop but a warning is issued, and the second stage, in which the molding process is immediately stopped. This prevents the operation of the injection molding equipment from being stopped unnecessarily.
The operating rate of the device can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a control panel showing an embodiment of the present invention, FIG. 2 is a plan view showing details of the keyboard 12 shown in FIG. 1, and FIG. A plan view showing details of the temperature screen, FIGS. 4a and 4b are configuration diagrams showing an example of an injection molding machine to which the present invention is applied, and FIG. 5 is a cross section showing the configuration of a hot water tank for post-processing of molded products. It is a diagram. 1...Control panel, 2...Input terminal board, 8...
CPU, 12... Keyboard (KB), 13...
CRT, 15...Output terminal board, 16...Function key, 19...Cursor key, 21...Numeric keypad, 25...Moving mold, 26...Fixed mold,
29, 30, 46... Hot water circulation machine, 31... Nozzle, 36... Heating cylinder, 38... Raw resin dryer (hopper dryer), 39... Air superheating chamber,
T1~T15...Thermocouple (temperature sensor), H1~
H5, H8, H10~H15...Heater, MV7
~MV9, MV13~MV15...Solenoid valve.

Claims (1)

[Scope of Claims] 1. In an injection molding apparatus equipped with at least a mold temperature adjustment device and peripheral equipment of a raw material dryer in addition to the injection molding machine main body, at least a plurality of heater temperatures in the heating cylinder of the injection molding machine main body are controlled. , a temperature sensor that detects each of the resin temperature in the heating cylinder, the fixed mold temperature and the movable mold temperature of the mold temperature adjustment device, and the hopper dryer temperature of the raw material dryer; and the temperature of the plurality of heaters and the resin temperature. , fixed mold temperature, movable mold temperature, and hopper dryer temperature, measured values, set values that serve as reference values, and settings that are set based on the set values, and if the values exceed the values, the molding process will not stop but a warning will be issued. 1, and a second upper limit and lower limit that are set based on the set value and stop the molding process when the value exceeds the set value, respectively. a temperature display panel; temperature setting means for setting the set value, a first upper limit value and a lower limit value, and a second upper limit value and a lower limit value; and an actual value detected by the temperature sensor as a first upper limit value. and a control means for stopping the molding process when the actual measured value detected by the temperature sensor exceeds the second upper limit or lower limit. An injection molding device characterized by: